+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18367 (1991 FS1) Classification: Main-belt Asteroid          SPK-ID: 2018367 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1495163666966175 3.2783e-08   a 2.423029123290066 7.8878e-09 au q 2.060746612375645 8.0205e-08 au i .4074700523867551 3.5828e-06 deg node 51.61085937014226 0.00047568 deg peri 179.8157578814636 0.00047581 deg M 274.7931246886036 1.2078e-05 deg tp 2459526.568252917998 (2021-Nov-08.06825292) 4.6782e-05 TDB period 1377.64201094673 3.77 6.7271e-06 1.842e-08 d yr n .2613160727819299 1.276e-09 deg/d Q 2.785311634204487 9.0672e-09 au   Orbit Determination Parameters    # obs. used (total)      1967      data-arc span      24365 days (66.71 yr)      first obs. used      1954-06-30      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49937      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:27:39   Additional Information  Earth MOID = 1.04876 au   Jupiter MOID = 2.20373 au   T_jup = 3.497  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.4   n/a MPO452431   diameter diameter 3.609 km 0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.196   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18367 (1991 FS1)          Discovered 1991-Mar-17 by Debehogne, H. at La Silla Reference: 20001111/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1991 FS1 = 1992 RP2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 13:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin